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