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