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