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