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