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)(33,34,38,39)(35,43,46,60)(36,41,47,54)(37,51,52,42)(40,55,53,45)(44,61,48,64)(49,59,50,58)(56,62,57,63)(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)(34,39)(36,47)(40,53)(42,51)(43,60)(44,48)(49,50)(62,63)(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)(33,35,37,45,38,46,52,55)(34,40,42,43,39,53,51,60)(36,48,50,62,47,44,49,63)(41,57,59,64,54,56,58,61)(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)(34,41)(35,44)(37,50)(38,47)(39,54)(40,56)(42,59)(43,61)(45,63)(46,48)(49,52)(51,58)(53,57)(55,62)(60,64)(1,5,6,4)(2,8,9,14)(3,12,13,11)(7,15,10,16)(19,26)(22,30)(25,27)(29,31)(33,37,38,52)(34,42,39,51)(35,45,46,55)(36,49,47,50)(40,43,53,60)(41,58,54,59)(44,62,48,63)(56,64,57,61)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.