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