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