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