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