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)(7,11)(12,16)(13,15)(18,23)(19,26)(20,21)(25,30)(27,31)(28,29) involution — undirected(1,3,6,13)(2,7,9,16)(4,11,5,12)(8,15,14,10)(17,18,22,25)(19,27,29,31)(20,30,21,23)(24,26,32,28)(1,4,6,5)(2,8,9,14)(3,11,13,12)(7,15,16,10)(17,19,22,29)(18,24,25,32)(20,26,21,28)(23,31,30,27)(1,4,6,5)(2,8,9,14)(3,12,13,11)(7,10,16,15)(18,25)(23,30)(24,32)(27,31)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.