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