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