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