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