One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,9,6,3,10,8)(4,7,12,15,13,11,16,14)(17,18,22,26,23,27,21,37)(19,28,31,39,32,44,30,24)(20,25,36,42,34,41,35,48)(29,43,46,40,33,47,45,38)(17,19,21,30,23,32,22,31)(18,24,26,28,27,39,37,44)(20,33,35,46,34,29,36,45)(25,40,42,47,41,38,48,43)(1,3)(2,6)(4,11)(5,8)(7,13)(9,10)(12,14)(15,16)(20,34)(25,41)(29,33)(35,36)(38,40)(42,48)(43,47)(45,46) involution — undirected(1,4,5,12,6,13,10,16)(2,7,9,15,3,11,8,14)(17,20,21,35,23,34,22,36)(18,25,37,48,27,41,26,42)(19,29,30,45,32,33,31,46)(24,38,44,47,39,40,28,43)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.