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