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