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