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