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