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