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