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)(19,27)(20,21)(22,25)(23,26)(24,28)(29,30)(31,32)(9,11)(10,13)(12,16)(14,15)(17,19,22,28)(18,24,25,27)(20,29,31,26)(21,23,32,30)(2,5)(6,8)(10,14)(11,16)(17,20,30,27,22,31,23,24)(18,21,29,19,25,32,26,28)(10,14)(13,15)(18,25)(20,31)(24,27)(26,29) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,30,19,22,32,23,28)(18,20,29,27,25,31,26,24)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.