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