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