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