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