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