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