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