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