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