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