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