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