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