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