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