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