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