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