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