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