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