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