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