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