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