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