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