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