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