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