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)(19,27)(20,21)(22,26)(23,25)(24,30)(28,31)(29,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,10,12,15)(11,13,16,14)(17,19,22,30)(18,24,26,27)(20,28,25,32)(21,29,23,31)(10,13)(11,16)(14,15)(17,20,21,18,22,25,23,26)(19,28,31,27,30,32,29,24)(2,6)(5,7)(17,21,22,23)(18,25,26,20)(19,29,30,31)(24,32,27,28)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.