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