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