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