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