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