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