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