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