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