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