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