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)(20,28)(21,32)(23,26)(24,27)(25,30)(29,31)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,19,23,27,24,26,22,18)(20,25,21,29,31,32,30,28)(3,7)(6,8)(10,14)(13,16)(17,20)(18,25)(19,28)(21,22)(23,30)(24,31)(26,29)(27,32) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,23,31,24,30,22,20)(18,25,19,29,27,32,26,28)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.