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