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