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