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