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