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