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