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