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)(18,23)(19,26)(20,21)(24,28)(27,29)(30,32)(1,3,4,8)(2,5,6,7)(18,24)(23,28)(25,31)(30,32)(11,15)(13,16)(17,18)(19,25)(20,28)(21,23)(22,24)(26,32)(27,31)(29,30) involution — undirected(9,10)(11,16)(12,14)(13,15)(17,19,22,27)(18,25,24,31)(20,26,21,29)(23,30,28,32)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.