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