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