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