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