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