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