One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,9,12)(7,8,11,10)(13,14)(15,22)(16,26)(17,21)(18,20)(19,25)(23,27)(24,28)(5,7,9,11)(6,10,12,8)(13,14)(15,23)(16,20)(17,21)(18,26)(19,24)(22,27)(25,28)(2,4)(5,8,9,10)(6,11,12,7)(13,15)(14,19)(16,24)(17,25)(18,27)(20,28)(21,22)(23,26)(2,4)(6,12)(7,11)(13,16,17,18)(14,20,21,26)(15,24,25,27)(19,28,22,23)(14,21)(19,22)(20,26)(23,28) involution — undirectedA 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.