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