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