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