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