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