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