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