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