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