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