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