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