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