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