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