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