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