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