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