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