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