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