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