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