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