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