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