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