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