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