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