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