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