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