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