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