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