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