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