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