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