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)(13,14,19,28,17,20,18,23)(15,24,27,21,22,26,25,16)(1,2)(3,4)(5,6)(7,11)(8,10)(9,12)(14,20)(15,22)(23,28)(25,27) involution — undirected(5,7,8,12)(6,9,10,11)(13,15)(14,21)(16,20)(17,22)(18,27)(19,25)(23,26)(24,28)(2,4)(7,12)(9,11)(13,16,17,21)(14,22,20,15)(18,26,19,24)(23,27,28,25)(6,10)(9,11)(14,20)(16,21)(23,28)(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.