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