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