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