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