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