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