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