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)(17,18,22,28,23,27,39,43,24,19,25,31,21,30,38,46)(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)(17,19,22,31,23,30,39,46,24,18,25,28,21,27,38,43)(20,33,40,47,37,26,41,45,34,32,36,48,35,29,44,42)(1,4,5,13,7,15,6,14)(2,8,10,12,9,16,3,11)(17,20,21,35,24,34,23,37)(18,26,27,32,19,29,30,33)(22,36,38,41,25,40,39,44)(28,42,43,47,31,45,46,48)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.