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)(11,15)(12,13)(14,16)(17,18,23,29)(19,27,32,25)(20,34,37,45)(21,39,33,42)(22,30,24,28)(26,38,44,36)(31,47,48,43)(35,46,40,41)(1,3,5,4)(2,6,8,7)(9,10)(11,14)(12,13)(15,16)(17,19)(18,25)(20,35)(21,22)(23,32)(24,33)(26,43)(27,29)(28,39)(30,42)(31,36)(34,41)(37,40)(38,48)(44,47)(45,46)(10,13)(14,15)(17,20,24,38,23,37,22,36)(18,26,30,45,29,44,28,34)(19,31,21,40,32,48,33,35)(25,41,39,47,27,46,42,43)(9,11,12,16)(10,14,13,15)(17,21,22,19,23,33,24,32)(18,27,28,39,29,25,30,42)(20,35,36,48,37,40,38,31)(26,41,34,43,44,46,45,47)(1,4,5,3)(2,7,8,6)(17,22,23,24)(18,28,29,30)(19,21,32,33)(20,36,37,38)(25,39,27,42)(26,34,44,45)(31,40,48,35)(41,47,46,43)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.