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