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