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