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