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