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