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