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