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