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