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