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