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