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