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