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