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