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