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