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