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