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