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