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