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