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