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