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