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