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