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