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