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