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