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