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