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