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