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