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