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