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