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