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