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