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