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)(13,14,18,23,19,24,17,22)(15,25,21,28,26,16,27,20)(5,6)(7,10)(8,11)(9,12)(13,15)(14,20)(16,23)(17,21)(18,27)(19,26)(22,25)(24,28) involution — undirected(1,2,3,4)(5,7,10,6)(8,11,9,12)(13,16,19,25)(14,21,24,27)(15,23,26,22)(17,28,18,20)(5,8,10,9)(6,11,7,12)(13,14,18,23,19,24,17,22)(15,16,21,20,26,25,27,28)(5,9,10,8)(6,11,7,12)(13,17,19,18)(14,22,24,23)(15,21,26,27)(16,20,25,28)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.