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