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