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