One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,11)(4,16)(5,19)(6,10)(7,14)(8,18)(9,12)(13,27)(15,23)(17,30)(20,25)(21,28)(22,26)(24,29)(31,32)(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(1,3,12,25,6,15,5,14)(2,7,19,23,10,20,9,11)(4,13,26,32,17,28,18,29)(8,21,30,31,22,27,16,24)(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)(4,17)(7,20)(8,22)(11,23)(13,28)(16,30)(18,26)(29,32)(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)(1,4,12,26,6,17,5,18)(2,8,19,30,10,22,9,16)(3,13,25,32,15,28,14,29)(7,21,23,31,20,27,11,24)(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.