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