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