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