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