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