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