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