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