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