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