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