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