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