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