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