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