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