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