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