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