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