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