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