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