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