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