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