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