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)(9,19,21,42)(10,25,28,57)(11,29,31,59)(12,32,30,17)(14,33,34,22)(15,37,39,20)(16,40,41,26)(23,53,49,70)(24,54,50,45)(27,58,47,56)(35,65,64,69)(36,52,60,63)(38,48,55,66)(43,62,67,46)(44,61,68,51)(7,9,20,46,11,23,47,63,30,50,66,65,40,61,28,33,13,21,37,62,31,49,27,52,12,24,48,69,26,51,10,22)(8,14,25,44,16,35,55,54,32,60,58,70,59,67,39,42,18,34,57,68,41,64,38,45,17,36,56,53,29,43,15,19)(3,4,5,6)(9,21)(14,34)(19,42)(22,33)(23,49)(24,50)(35,64)(36,60)(43,67)(44,68)(45,54)(46,62)(51,61)(52,63)(53,70)(65,69)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.