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