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