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