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