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