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