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