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