One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(9,10)(11,22)(12,18)(13,17)(14,33)(15,34)(16,23)(19,30)(20,31)(21,29)(24,35)(25,57)(26,38)(27,40)(28,62)(32,46)(36,53)(37,58)(39,50)(41,63)(42,61)(43,59)(44,60)(45,64)(47,55)(48,54)(49,52)(51,65)(56,68)(66,72)(67,70)(69,71) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,11)(10,16)(12,23)(13,24)(14,25)(15,26)(17,39)(18,22)(19,36)(20,37)(21,38)(27,50)(28,51)(29,52)(30,55)(31,54)(32,56)(33,65)(34,49)(35,40)(41,69)(42,68)(43,47)(44,48)(45,66)(46,67)(53,59)(57,62)(58,60)(61,70)(63,72)(64,71) involution — undirected(2,5)(6,8)(10,17)(11,23)(13,30)(14,31)(15,29)(16,35)(18,40)(19,20)(21,46)(22,39)(24,53)(25,58)(27,59)(28,60)(32,64)(33,41)(34,42)(36,48)(37,47)(38,68)(43,44)(45,62)(49,67)(50,55)(51,54)(56,72)(57,69)(61,63)(65,66)(70,71) involution — undirected(1,3,4,7)(2,6,5,8)(10,18)(16,22)(17,40)(19,43)(20,44)(21,34)(33,62)(35,39)(36,47)(37,48)(38,49)(41,45)(42,46)(57,65)(66,69)(67,68)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.