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