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