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