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)(13,14,18,21)(15,19,17,25)(16,23,24,27)(20,26,28,22)(2,3)(5,6)(7,11)(8,10)(9,12)(13,15,18,17)(14,19,21,25)(16,22,24,26)(20,27,28,23)(5,7)(6,9)(8,12)(10,11)(13,16,18,24)(14,20,21,28)(15,22,17,26)(19,27,25,23)(1,3,4,2)(7,12)(9,11)(16,24)(20,28)(22,26)(23,27)(6,10)(9,11)(14,21)(19,25)(20,28)(23,27) 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.