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