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