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