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