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