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