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