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