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