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