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