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