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