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