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