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