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