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