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