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