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