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