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