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