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)(11,13)(12,14)(15,16)(17,18)(19,25)(20,21)(22,24)(23,28)(26,31)(27,32)(29,30) involution — undirected(2,5)(3,7)(9,11,12,15)(10,13,14,16)(17,19,21,28)(18,23,20,25)(22,31,30,27)(24,32,29,26)(10,14)(13,16)(17,20,21,18)(19,26,28,32)(22,24,30,29)(23,31,25,27)(2,5)(6,8)(18,20)(23,25)(24,29)(26,32) involution — undirected(1,3,4,7)(2,6,5,8)(19,27)(22,30)(23,26)(24,29)(25,32)(28,31)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.