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