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