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