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