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