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