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