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