documentclass[border=1mm]{standalone}
usepackage{siunitx}
usepackage{tikz}

begin{document}

begin{tikzpicture}
]
  node (n1) at (0,0)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_1$};
  node (n2) at (2,2)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_2$};
  node (n3) at (4,4)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_3$};

  node (n4) at (3,0)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_4$};
  node (n5) at (5,2)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_5$};
  node (n6) at (7,4)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_6$};

  node (n7) at (6,0)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_7$};
  node (n8) at (8,2)  [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_8$};
  node (n9) at (10,4) [draw=black,auto=left,circle,thick,fill=red!50,scale=1.3] {$mathbf{X}_9$};

  node (n11) at (0,5)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{10}$};
  node (n22) at (2,7)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{11}$};
  node (n33) at (4,9)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{12}$};

  node (n44) at (3,5)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{13}$};
  node (n55) at (5,7)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{14}$};
  node (n66) at (7,9)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{15}$};

  node (n77) at (6,5)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{16}$};
  node (n88) at (8,7)  [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{17}$};
  node (n99) at (10,9) [draw=black,auto=left,circle,thick,fill=green!50,scale=1.2] {$mathbf{Y}_{18}$};

  node (n7h) at (9,0)  [] {$ $};
  node (n8h) at (11,2) [] {$ $};
  node (n9h) at (13,4) [] {$ $};

  node (n1l) at (-3,0) [] {$ $};
  node (n2l) at (-1,2) [] {$ $};
  node (n3l) at (1,4)  [] {$ $};

  node (n1f) at (-2,-2) [] {$ $};
  node (n4f) at (1,-2)  [] {$ $};
  node (n7f) at (4,-2)  [] {$ $};

  node (n3t) at (6,6)  [] {$ $};
  node (n6t) at (9,6)  [] {$ $};draw ($(n1)!1cm!(n1l)$) -- ($(n1)!3cm!(n1l)$);
  node (n9t) at (12,6) [] {$ $};

  foreach from/to in {n11/n1,n22/n2,n33/n3,n44/n4,n55/n5,n66/n6,n77/n7,n88/n8,n99/n9}[ultra thin] draw (from) -- (to);
  foreach from/to in {n1/n2,n2/n3,n4/n5,n5/n6,n7/n8,n8/n9} draw[ultra thick] (from) -- (to);
  foreach from/to in {n1/n4,n4/n7,n2/n5,n5/n8,n3/n6,n6/n9} draw[ultra thick] (from) -- (to);
  foreach from/to in {n7/n7h,n8/n8h,n9/n9h} draw (from)[dashed] -- (to);
  foreach from/to in {n1/n1l,n2/n2l,n3/n3l} draw (from)[dashed] -- (to);
  foreach from/to in {n1/n1f,n4/n4f,n7/n7f} draw (from)[dashed] -- (to);
  foreach from/to in {n3/n3t,n6/n6t,n9/n9t} draw (from)[dashed] -- (to);
end{tikzpicture}

end{document}