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