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