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