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