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