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