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