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