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