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