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