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