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