One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(4,6)(7,8)(9,19)(10,25)(11,15)(12,31)(13,32)(14,21)(16,20)(17,26)(18,30)(22,39)(23,52)(24,53)(27,54)(28,58)(29,59)(33,48)(34,62)(35,63)(36,44)(37,57)(38,64)(40,43)(41,47)(42,51)(45,56)(46,55)(49,60)(50,69)(61,70)(65,67)(66,68) involution — undirected(7,9,20,43,12,23,45,63,30,51,64,70,57,68,27,48,11,22,44,67,29,50,28,49,13,24,46,62,26,47,10,21)(8,14,25,41,17,34,55,53,32,60,58,69,59,65,36,39,15,33,54,66,37,61,38,42,18,35,56,52,31,40,16,19)(3,4,5,6)(8,15)(14,33)(16,36)(17,37)(18,32)(19,39)(25,54)(31,59)(34,61)(35,60)(38,55)(40,65)(41,66)(42,53)(52,69)(56,58)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.