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