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