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