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