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