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