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