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)(17,18,23,29)(19,27,33,25)(20,34,38,44)(21,40,32,42)(22,30,24,28)(26,37,45,39)(31,43,47,48)(35,41,36,46)(2,6)(7,8)(9,11)(10,13)(12,15)(14,16)(17,19,23,33)(18,25,29,27)(20,35,38,36)(21,22,32,24)(26,43,45,48)(28,42,30,40)(31,39,47,37)(34,46,44,41)(1,3,5,4)(2,7,6,8)(17,20,22,37,23,38,24,39)(18,26,28,44,29,45,30,34)(19,31,21,35,33,47,32,36)(25,41,40,43,27,46,42,48)(11,15)(13,16)(17,21,24,19,23,32,22,33)(18,27,30,40,29,25,28,42)(20,36,39,47,38,35,37,31)(26,41,34,48,45,46,44,43)(1,4,5,3)(2,7,6,8)(17,22,23,24)(18,28,29,30)(19,32,33,21)(20,37,38,39)(25,42,27,40)(26,44,45,34)(31,36,47,35)(41,48,46,43)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.