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