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