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