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