documentclass[tikz,border=3.14mm]{standalone}
begin{document}
begin{tikzpicture}[bn/.style={circle,fill,font=sffamily,minimum
size=2mm,node contents={},label=#1}]
 path node(1) [bn=1]  -- ++ (50:2.5) node (2) [bn=2]  -- ++(-95:1.75)
 node (3) [bn=above right:3]
 -- ++(-85:1.75) node (4) [bn=below:4]  -- ++(40:2.75) node (5) [bn=below right:5]
 -- ++ (0,1.75) node (6) [bn=6]  ;
 draw[thick] (1)--(2)--(6)--(5)--(4)--(1)--(3)--(5)--(2)--(3)--(4);
end{tikzpicture}
end{document}