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