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