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