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