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