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