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