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