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