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