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)(14,19)(20,27)(21,26)(22,28)(6,9)(10,12)(13,14)(15,21)(16,19)(17,20)(18,26)(22,25)(23,28)(24,27) involution — undirected(2,4)(5,7)(6,10)(8,11)(9,12)(14,20)(15,18)(17,25)(19,27)(21,22)(23,24)(26,28) involution — undirected(7,11)(10,12)(13,15,16,18)(14,21,19,26)(17,23,24,25)(20,28,27,22)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.