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