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