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