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