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