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