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