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