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