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