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