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