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