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