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