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