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