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