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