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