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