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