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