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