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