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)(20,31,34,25)(21,26,37,36)(28,38,43,32)(29,41,40,35)(33,44,47,39)(42,48,46,45)(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,14,15,16)(17,19,22,30)(18,24,23,27)(20,32,34,38)(21,35,37,41)(25,28,31,43)(26,40,36,29)(33,46,47,42)(39,45,44,48)(9,12,13,11)(10,14,15,16)(17,20)(18,25)(19,28)(21,33)(22,34)(23,31)(24,38)(26,39)(27,32)(29,42)(30,43)(35,48)(36,44)(37,47)(40,46)(41,45)(2,6)(5,7)(17,18,22,23)(19,24,30,27)(20,25,34,31)(21,36,37,26)(28,38,43,32)(29,41,40,35)(33,44,47,39)(42,45,46,48)(3,8)(5,7)(17,21,22,37)(18,26,23,36)(19,29,30,40)(20,33,34,47)(24,35,27,41)(25,39,31,44)(28,42,43,46)(32,45,38,48)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.