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