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