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