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