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