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)(11,14)(12,13)(15,16)(17,18,23,28)(19,24,30,37)(20,25,32,39)(21,26,34,41)(22,27,35,42)(29,36,44,47)(31,38,45,48)(33,40,43,46)(1,3)(2,5)(4,8)(6,7)(17,19,23,30)(18,24,28,37)(20,31,32,45)(21,22,34,35)(25,38,39,48)(26,27,41,42)(29,43,44,33)(36,46,47,40)(10,13)(14,16)(17,20,22,33,23,32,35,43)(18,25,27,40,28,39,42,46)(19,29,21,31,30,44,34,45)(24,36,26,38,37,47,41,48)(2,6)(5,7)(20,32)(25,39)(29,44)(31,45)(33,43)(36,47)(38,48)(40,46) involution — undirected(3,8)(5,7)(9,11,12,15)(10,14,13,16)(17,21,22,30,23,34,35,19)(18,26,27,37,28,41,42,24)(20,31,33,44,32,45,43,29)(25,38,40,47,39,48,46,36)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.