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