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