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