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