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