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