One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,7)(4,8)(9,10)(11,14)(12,15)(13,16)(18,23)(20,21)(24,31)(25,26)(27,32)(28,30) involution — undirected(1,2)(3,5)(4,7)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18,22,25)(19,27,29,31)(20,26,21,23)(24,30,32,28)(1,3,5,2)(4,6,8,7)(10,14)(11,12)(15,16)(17,19,22,29)(18,24,25,32)(20,28,21,30)(23,27,26,31)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.