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