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