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)(15,18)(16,21)(17,22)(19,20)(23,25)(24,27)(26,28)(5,6)(7,10)(8,9)(11,12)(13,15,19,24)(14,18,20,27)(16,17,23,26)(21,22,25,28)(1,3,4,2)(14,20)(18,27)(21,25)(22,28)(5,7,8,11)(6,10,9,12)(13,16)(14,21)(15,17)(18,22)(19,23)(20,25)(24,26)(27,28)(13,17)(14,22)(15,23)(16,24)(18,25)(19,26)(20,28)(21,27) involution — undirected(13,18,19,27)(14,15,20,24)(16,22,23,28)(17,25,26,21)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.