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