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