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