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