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