One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(4,6)(7,8,13,18)(9,19,24,45)(10,25,28,57)(11,29,31,59)(12,32,30,17)(14,33,36,21)(15,37,39,20)(16,40,41,26)(22,51,53,70)(23,54,52,44)(27,58,47,56)(34,64,65,69)(35,50,60,63)(38,48,55,66)(42,62,67,46)(43,61,68,49)(7,9,20,46,11,22,47,63,30,52,66,64,40,61,28,33,13,24,37,62,31,53,27,50,12,23,48,69,26,49,10,21)(8,14,25,43,16,34,55,54,32,60,58,70,59,67,39,45,18,36,57,68,41,65,38,44,17,35,56,51,29,42,15,19)(3,4,5,6)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.