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