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