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