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