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