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