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