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