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