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