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