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