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