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