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)(17,18,21,24)(19,25,26,32)(20,28,29,23)(22,30,31,27)(1,3,6,14)(2,7,9,16)(4,13,5,12)(8,11,15,10)(20,29)(23,28)(25,32)(27,30)(1,2)(3,11)(4,8)(5,15)(6,9)(7,12)(10,14)(13,16)(17,19)(18,22)(20,30)(21,26)(23,32)(24,31)(25,28)(27,29) involution — undirected(19,26)(22,31)(25,32)(27,30) 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.