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