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