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