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