SeedRandom[1];

data = RandomInteger[100, {100, 3}];

x = data[[All,1]];
y = data[[All,2]];
z = data[[All,3]];

(* e.g. own color table *)
number = Length@z;
colTable = {Table[{Blend[{Blue, Green, Yellow, Red}, i]}, {i, 1/number, 1, 1/number}]};
colTable = Flatten[colTable];