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)(12,13)(14,16)(17,18)(19,28)(20,22)(21,26)(23,27)(24,29)(25,30)(31,32) involution — undirected(2,6)(7,8)(9,10)(11,14)(12,13)(15,16)(17,19,21,29)(18,24,26,28)(20,25,27,32)(22,31,23,30)(10,13)(14,15)(17,19,22,30,21,29,23,31)(18,25,27,28,26,32,20,24)(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,14,13,15)(17,20,23,26,21,27,22,18)(19,28,31,25,29,24,30,32)(1,4,5,3)(2,7,6,8)(18,26)(20,27)(24,28)(25,32)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.