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