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)(15,19)(16,18)(17,20)(21,24)(22,28)(23,27)(25,26)(5,6,9,10)(7,8,12,11)(14,18)(15,22)(16,24)(19,27)(20,21)(23,25)(2,4)(5,7)(6,11)(8,10)(9,12)(15,23)(19,27)(22,25)(26,28) involution — undirected(6,10)(7,12)(13,15)(14,19)(16,25)(17,23)(18,26)(20,27)(21,28)(22,24) involution — undirected(5,8,9,11)(6,7,10,12)(14,20)(18,21)(19,27)(26,28)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.