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