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)(19,25)(20,23)(21,24)(22,27)(26,30)(28,32)(29,31) involution — undirected(1,3,6,12,7,4,8,15)(2,5,10,9,11,16,14,13)(17,19,21,27)(18,22,24,25)(20,28,29,26)(23,30,31,32)(1,4,7,3)(2,9,11,13)(5,10,16,14)(6,15,8,12)(17,20)(18,23)(19,26,27,28)(21,29)(22,30,25,32)(24,31)(1,5,6,9,7,16,8,13)(2,3,10,12,11,4,14,15)(18,24)(22,25)(23,31)(30,32)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.