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