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