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