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