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)(15,23,25,16)(18,27,26,22)(20,21,28,24)(1,2)(3,4)(6,10)(11,12)(14,19)(15,24)(16,20)(18,26)(21,25)(23,28) involution — undirected(5,7,9,8)(6,11,10,12)(13,15,18,24,17,25,26,21)(14,20,22,23,19,28,27,16)(2,4)(13,16,18,20,17,23,26,28)(14,21,22,15,19,24,27,25)(5,8,9,7)(6,11,10,12)(14,19)(16,23)(20,28)(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.