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