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