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