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