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