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