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