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