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