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