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