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