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