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