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