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