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