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