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