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