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