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