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