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