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