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