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