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