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