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