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