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