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