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