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