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