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