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