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