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