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