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