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