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)(20,24)(21,30)(22,25)(23,28)(27,32)(29,31) involution — undirected(2,5)(6,7)(9,11)(10,13)(12,16)(14,15)(17,19,20,29,22,27,21,28)(18,23,30,32,25,31,24,26)(1,3,4,8)(2,6,5,7)(11,16)(13,14)(19,27)(23,31)(26,32)(28,29)(9,11)(10,14)(12,16)(13,15)(17,18)(19,23)(20,30)(21,24)(22,25)(26,28)(27,31)(29,32) involution — undirected(11,16)(13,14)(17,20,22,21)(18,24,25,30)(19,28,27,29)(23,32,31,26)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.