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