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