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