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