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