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