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