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