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