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