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