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