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