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)(20,23)(21,25)(22,29)(24,30)(27,31)(28,32) involution — undirected(1,3,6,13)(2,7,9,15)(4,12,5,11)(8,16,14,10)(17,19,21,28)(18,22,25,31)(20,27,30,29)(23,26,24,32)(18,23)(19,27)(20,30)(24,25)(26,32)(28,29) involution — undirected(1,4,6,5)(2,8,9,14)(3,11,13,12)(7,10,15,16)(19,28)(22,31)(26,32)(27,29)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.