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