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