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