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