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