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