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