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