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