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