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