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