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