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