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