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)(19,26)(20,23)(21,25)(22,30)(24,28)(27,31)(29,32) involution — undirected(1,3,5,11)(2,6,7,15)(4,13,14,10)(8,16,12,9)(17,19,23,29)(18,24,20,27)(21,28,22,31)(25,32,30,26)(17,18,23,20)(19,24,29,27)(21,25,22,30)(26,28,32,31)(2,7)(6,15)(8,12)(9,16)(17,20,23,18)(19,27,29,24)(21,25,22,30)(26,28,32,31)(17,21,23,22)(18,25,20,30)(19,28,29,31)(24,32,27,26)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.