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