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