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