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