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