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