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