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