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