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