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