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