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)(18,23)(19,26)(20,21)(24,27)(25,30)(28,29) involution — undirected(17,18,22,25)(19,27,29,24)(20,30,21,23)(26,32,28,31)(1,3)(2,7)(4,11)(5,14)(6,12)(8,15)(9,16)(10,13)(17,19,20,28,22,29,21,26)(18,24,23,31,25,27,30,32)(1,4,6,5)(2,8,9,13)(3,11,12,14)(7,15,16,10)(18,25)(23,30)(24,27)(31,32)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.