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