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