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