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