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