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