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