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