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