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