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)(15,23,27,25)(16,22,18,21)(20,26,28,24)(5,6)(7,11)(8,10)(9,12)(13,15)(14,20)(16,24)(17,28)(18,26)(19,27)(21,23)(22,25) involution — undirected(2,4)(5,7,8,12)(6,9,10,11)(13,16,19,18)(14,21,17,22)(15,24,27,26)(20,23,28,25)(7,12)(9,11)(13,17,19,14)(15,25,27,23)(16,21,18,22)(20,24,28,26)(6,10)(9,11)(13,16,19,18)(14,22,17,21)(15,26,27,24)(20,23,28,25)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.