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