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