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