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