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