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