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