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