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