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