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