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