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