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