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