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