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