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