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