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