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