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