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