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