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