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