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