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