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