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