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