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