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