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