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