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