One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,8,10)(7,9,11,12)(14,19)(15,23)(17,25)(20,26)(21,24)(22,28)(5,7)(6,9)(8,11)(10,12)(13,14,17,19,18,22,25,28)(15,24,16,26,23,20,27,21)(2,4)(7,11)(9,12)(13,15)(14,20)(16,17)(18,23)(19,21)(22,24)(25,27)(26,28) involution — undirected(5,7)(6,9)(8,11)(10,12)(13,16)(14,21)(15,25)(17,23)(18,27)(19,24)(20,28)(22,26) involution — undirected(7,11)(9,12)(15,23)(16,27)(20,24)(21,26) 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.